Siemens 5-GMI-350 - Trunnion and Movable Contact Adjustment; Open Stroke Adjustment

Maintenance
&
Overhaul
Page
31
and
spring
cap
which
become
available
after
the
opening
spring
is
removed
.
The
opening
spring
pull
rod
is
disassembled
by
unthreading
the
rod
from
the
jackshaft
pivot
.
Reassembly
requires
the
parts
be
assembled
in
reverse
order
.
If
used
,
the
kickoff
spring
is
not
to
be
assembled
with
precompression
.
Apply
jam
nuts
and
spring
cap
to
bear
firmly
on
the
kickoff
spring
and
jam
the
retaining
nuts
by
opposite
rotation
.
The
opening
spring
must
be
precompressed
upon
assemb
-
ly
by
advancing
the
retaining
nuts
until
the
proper
spring
length
is
obtained
.
Jam
the
retaining
nuts
by
opposite
rotation
.
Two
different
opening
springs
are
used
,
depending
on
the
circuit
breaker
ratings
.
One
spring
has
a
free
length
of
12
inches
,
and
when
installed
should
be
compressed
to
9.0
inches
.
The
other
has
a
free
length
of
7.5
inches
,
and
when
installed
should
be
compressed
to
6.88
inches
.
screws
which
attach
the
close
coil
and
the
quick
disconnect
terminal
for
control
leads
.
The
trip
coil
arrangement
is
similar
.
Replacement
of
Anti
-
Pump
Relay
(
Device
52
Y
)
Figure
55
helps
illustrate
the
anti
-
pump
relay
removal
pro
-
cedure
.
The
two
nuts
holding
the
relay
and
its
mounting
bracket
are
removed
.
The
wires
connected
to
the
relay
m
3
Figure
54
.
Replacement
of
Closing
Solenoid
.
I
Figure
53
.
Removal
of
Opening
Spring
.
Replacement
of
Closing
and
Tripping
Solenoids
(
Devices
52
SRC
and
52
T
)
Replacement
of
either
the
closing
or
tripping
solenoids
is
straightforward
.
Each
solenoid
has
two
mounting
screws
and
one
quick
disconnect
terminal
.
Removing
the
mounting
bolts
and
quick
disconnect
terminal
of
the
solenoid
permits
it
to
be
slid
out
and
removed
.
Replacement
requires
careful
insertion
of
the
solenoid
and
re
-
attachment
of
the
mounting
bolts
and
quick
disconnect
.
Figure
54
shows
the
two
Figure
55
.
Replacement
of
Anti
-
Pump
Relay
.
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